Neural network grade program of natural forest protection Greenhouse gas emissions and net carbon sequestration of the natural forest protection program in China Achievements in natural forest protection, ecological restoration, and sustainable management in China Vegetation Change Monitoring for the Natural Forest Protection Based on Spatial Analysis Techniques Evaluation on the influence of natural forest protection program on forest ecosystem service function in changbai mountain Carbon storage of forest vegetation under the Natural Forest Protection Program in Northeast China Carbon sequestration of China’s National Natural Forest Protection Project A Study on the Current Status and Development Countermeasures of the Natural Forest Resource Protection Projects in Tibet